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A GIS-based method of risk assessment on no. 11 coal-floor water inrush from Ordovician limestone in Hancheng mining area, China

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Abstract

The no. 11 coal seam in the deep area of Hancheng mining area is mining in recent years, which is threatened by the water inrush from the Ordovician limestone aquifer. Coal-floor water inrush is governed by the water abundance of coal-floor aquifer, the water-resisting performance of coal-floor aquitard, and the pathway connecting the water source and the working face. To make an accuracy risk assessment of water inrush from the no. 11 coal seam floor, a GIS-based vulnerability index method (VIM) is adopted for its superior comprehensive consideration of more controlling factors, powerful spatial analysis, and intuitively display functions. This study firstly established an index system including the water pressure of the coal-floor aquifer, the unit water inflow, the thickness, the core recovery percentage, the thickness ratio of brittle rocks to ductile rocks, the thickness of effective aquitard, and the accumulated length of faults and folds, of which the former six indexes governed the water abundance of the coal-floor aquifer which was combined with the last two factors to determine the risk of coal-floor water inrush. Secondly, the thematic map of each controlling factor is established by GIS using the geological prospecting data, and the weight of each factor is determined by the analytic hierarchy process (AHP) after consulting the expert review panel. At last, a vulnerability index is obtained and used to assess the risk of coal-floor water inrush of the no. 11 coal seam. The risk of water inrush of the no. 11 coal seam of the study area was ranked to three zones: the southeastern shallow area in red color is the dangerous zone, the wide northwestern area in green color is the safe zone, and the transition area in yellow color is the moderate-risk zone. Compared with the actual water-inrush incidents, the risk assessment result was verified to achieve an accuracy of 82.35%, which is proved to be a dependable reference for the prevention and controlling of coal-floor water inrush of the no. 11 coal seam in Hancheng mining area.

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Acknowledgments

The anonymous reviewers are most gratefully acknowledged for their helpful suggestions and comments for improving the original manuscript.

Funding

This research is financially supported by the China National Science Foundation (Grant 41472234) and the Ministry of Land and Resources Key Laboratory of Coal Resources Exploration and Comprehensive Utilization and by the PhD Research Startup Foundation of Xi’an University of Science and Technology (Grant 2017QDJ012) and the Young Teachers’ Fostering Foundation of Xi’an University of Science and Technology (Grant 201607).

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Authors and Affiliations

  1. College of Geology and Environment, Xi’an University of Science and Technology, No. 58 Yanta Road, Beilin District, Xi’an, 710054, China

    Gelian Dai, Xiaoyuan Xue, Ke Xu, Lei Dong & Chao Niu

  2. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, No. 26 Wenjing Road, Weiyang District, Xi’an, 710054, China

    Gelian Dai

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  1. Gelian Dai
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  2. Xiaoyuan Xue
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  3. Ke Xu
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  4. Lei Dong
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  5. Chao Niu
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Correspondence to Ke Xu.

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Dai, G., Xue, X., Xu, K. et al. A GIS-based method of risk assessment on no. 11 coal-floor water inrush from Ordovician limestone in Hancheng mining area, China. Arab J Geosci 11, 714 (2018). https://doi.org/10.1007/s12517-018-4071-8

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